public class TestPreference
{
    public static void main(String[] args)
    {
        Person dalao = new Person(75.0, 1.80);
        Person dezhong = new Person(75.0, 1.80);
    }
}
class Person
{
    private double kg;
    private double m;

    public Person(double kg, double m) {
        this.kg = kg;
        this.m = m;
    }
}
